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Researchers say nicer people are poorer. They are poorer than selfish people. It is more difficult for kinder people to look after their money. This is because kinder people are more "agreeable," trusting and caring. Kinder people have lower savings, higher debt, and difficulty in paying back debts.
Researchers looked at online surveys taken by 9,000 people. The data was about people's money situation, their debt, their feelings about money, and their personality. Kinder people cared less about money. They did not look after it. Being kind has "financial costs". A researcher wanted to know, "why nice guys seem to finish last".
Back to the nice people lesson.